The Australian designer Ben Lexcen invented the revolutionary winged keel to propel a 12-metre yacht to victory over the USA in the America’s Cup. Cheyne Horan must have thought that whatever works for a 12 metre boat will surely work on a five foot surfboard. Following that same assumption I’m not sure why he didn’t also add a Spinnaker. Cheyne was probably ahead of time, but the Winged Keel fin never really took off.